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Mathematics 20 Online
OpenStudy (anonymous):

In ΔABC shown below, point A is at (0, 0), point B is at (x2, 0), point C is at (x1, y1), point D is at (x1 over 2, y1 over 2), and point E is at (x1 +x2 over 2, y1 over 2) Prove that segment DE is parallel to segment AB

OpenStudy (anonymous):

http://imgur.com/LD732lQ

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